Patent GB-571206-A (GB)
Title: Apparatus for and method of winding electrical capacitors
IPC: H01G13/02
Filed: 1944-02-11
Abstract: 571,206. Winding electrical condensers. DEUTSCHMANN, T. Feb. 11, 1944, No. 2552. Convention date, July 20, 1943. [Class 100 (i)] In winding condensers of the kind in which a pair of metal foil strips lie between and are separated by paper strips, the strips are led to the winding mandrel in two separate sets of foil and paper strips connected to the mandrel at diametrically opposite sides thereof so that the ends of the metal strips are also at opposite sides of the mandrel, and, just prior to the completion of the winding the winding is interrupted, an additional length of the outer paper strip is unwound from the supply, all the strips are severed at a point which, except for the outer paper strip, is at substantially equal distances from the points of tangency of the strips with the mandrel. and the winding is completed, the extra length of paper forming a cover for the ends of the foil strips. Paper strips P', P<2>, Fig. 1, pass from supply rolls round a guide roller 18 and a guide bar or roller 22, and a foil strip F<1> round a guide roller 19 and bar or roller 23. The associated paper and foil strips then pass between feed rollers 36, 37 through an upper guide passage 45, across the path of a knife 46, through a further passage 53, Figs. 1 and 7, and into one end of a slot formed by the space between two aubstantially semi-cylindrical mandrel members 59, 56a. Foil and paper strips F<2>, P<4>, P<3> are similarly led over guide rollers 19, 20 and bars or rollers 24, 25 between the feed rollers 36, 37, and through guides 45a, 54 and into the other end of the mandrel slot so that the ends of the metal strips, are diametrically opposite. The mandrel member 59 has secured thereto a pinion engaging a gear wheel 59 provided with an operating crank 61, and a collar fixed to the shaft 60 of the gear 59 is provided with a depression engaged by stationary spring detents, the clicking sound of whichs-as they pass the depression-serving to assist the operator in counting the turns or partial turns of the mandrel. The upper feed roller 36 is operable through a free wheel device actuated by a pinion enjaged by a rack 29 pivoted at its lower end to an operating lever 35 and the lower roller 37 is mounted on an eccentric bearing which may be set so that the rollers are separated so as not to feed, brought together with sufficient pressure to feed only the top paper strip P<1> or pressed together to feed all the strips. Just before the completion of the winding, the winding is stopped and the rollers 36, 37 are set and operated to feed a length of the upper paper strip P only. A pivoted bar is then moved into the loop so formed and adjusted to tension the strip. The blade 46 is then depressed by its hand lever 49 to sever all the strips and the winding is resumed. When the foil strips are completely wound, the extra length of paper strip completely covers the ends of the foils. As the distance from the tangential points of the foil strips on the mandrel to the knife 46 is the same, the ends of the foil strips in the completed condenser are diametrically opposite to one another. A paste reservoir 69 is provided to enable the operator to stick the free end of the outer paper strip to the body of the condenser. A counter 73 may be provided, the actuating arm 72 being turned by the operator while actuating the knife 46. The rods or rollers 22-25 have collars to guide the edges of the strips, the collars for the foils being at different lateral positions from those of the paper strips so that the edges of the foils are offset from those of the paper. For non-inductive coils, the edge of one foil lies within and the corresponding edge of the other foil lies outside the edges of the paper strips, but for inductive coils both edges of the foils lie within the edges of the paper strips. The mandrel portion 56a is movable axially clear of the portion 59 to allow the wound condenser to be removed.